STEP related product data exchange standardisation at ESA

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STEP related product data exchange
standardisation at ESA

• Hans Peter de Koning (ESA/ESTEC D/TOS-MCV, The
  Netherlands)
• Hans-Peter.de.Koning_at_esa.int
• 6th NASA-ESA Workshop on Product Data Exchange
• April 20-23, 2004, EADS/Astrium, Friedrichshafen,
  Germany

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Topics

• ECSS European Cooperation for Space
  Standardization
• European set of standards for development and
  operation of space systems
• E-10 Part 2.3 Product data exchange
• E-10 Part 4.1 Modelling and simulation
• New E-10 Part 2.1 Engineering database
• STEP-NRF STEP-TAS
• Network-model Results Format Thermal Analysis
  for Space
• STEP-SPE
• Space Environment Analysis
• TASverter
• STEP-TAS thermal model converter

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ECSS

• ECSS is an initiative started in 1995to produce
  a single set of consistent European space
  standards
• Before there were ESA and national space
  standards
• Partners are ESA, national space agencies, space
  industry (via Eurospace)
• Three main branches
• M-series for Management Standards
• Q-series for Product Assurance Standards
• E-series for Engineering Standards
• http//www.ecss.nl for details and download of
  standards (in PDF)

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ECSS E-10 Part 2.3Product data exchange

• E-10 is the System engineering branch
• Part 2.3 is a high level umbrella standard for
  product data exchange
• References PDE standards, but does not define
  them
• It specifies clauses in the following
  format To exchange data from a
  ltsource_disciplinegt representation to a
  ltdestination_disciplinegt representation for
  transferring ltkind_of_product_datagt the
  ltstandard_referencegt standard shall be used.
• Addresses all (useful) combinations of all ECSS
  disciplines
• Constitutes a tailorable list of standardized PDE
  for use in specific space projects
• References mainly ISO 10303, STEP-based,
  XML-based standards
• Similar approach as in NASA-STD-2817Computer-Aid
  ed Engineering, Design and Manufacturing Data
  Interchange Standards
• WG convener Charles Stroom (ESA) / secretary
  Hans Peter de Koning (ESA)

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ECSS E-10 Part 2.3Product data exchange
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ECSS E-10 Part 2.3Product data exchange Status

• WG draft delivered for public review summer 2003
• Passed public review per 30 January 2004
• 3 comments raised disposition per April 2004
• Publication expected 2004 Q2 or Q3

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ECSS E-10 Part 2.1Engineering database

• WG being established April/May 2004
• Initial terms of reference ECSS System
  Engineering Integration and Control shall
  establish and control a database as a repository
  for engineering data from trade-offs, risk
  assessment, requirements, analysis, design, and
  verification
• WG convener Harald Eisenmann (EADS / Astrium)

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ECSS E-10 Part 4.1Modelling and simulation

• Development in progress WG started beginning
  2003
• Scope is standardization of model-based
  simulation in support of systems engineering
• Tailoring of ECSS E-40 Part 1 and 2 Software
  engineering for MS
• WG convener Juan Miro (ESA)

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STEP-NRF, STEP-TAS, STEP-SPE

• NRF Network-model Results Format
• Generic engineering discipline-independent
  exchange of network models and associated
  results data
• Kind of Integrated Resource ARM for STEP-TAS
  and STEP-SPE
• Architecture core SCHEMA plus runtime loadable
  dictionary
• TAS Thermal Analysis for Space
• Exchange of thermal analysis models for space
  applications
• SPE Space Environment Analysis
• Exchange of analysis and environment models for
  Atomic Oxygen, Micro-meteoroids/debris,
  Contamination, Particle radiation, Charging, On
  orbit perturbations, Plume impingement,
• Pure extension of NRF and TAS

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Recap STEP-NRF (1)

• Generic, discipline-independent exchange of
  models results
• Model definition, using a discrete network
  representation
• Supports model/submodel hierarchy
• Results data, produced in analysis, test or
  operation
• Meta-data, which records details of actual
  analysis, test or operation performed
• Only discrete observations
• I.e. sampled results at discrete locations for
  discrete states of the model / object under
  observation, no support for continuous fields or
  similar
• Any property value has explicit (physical)
  quantity and unit
• Data model designed to cope efficiently with
  large amounts of results
• Built-in support for scalar, vector, matrix,
  tensor data

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Recap STEP-NRF (2)
Central NRF data structure is the datacube -
each element of the cube is a scalar, vector or
tensor property for a specific (item, quantity,
state) - literal and advanced SUBTYPEs,
respectively for literal and generalised
functional property values
Usually points in time or frequency
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STEP-TAS

• STEP-based application protocol
• Initial scope Exchange of thermal-radiative
  models for space, including rigid body kinematics
  and orbit / attitude / orientation specification
• Geometry represented by bounded face model with
  minimal topology (compatible with AP 203 CC4)
• Extended scope Exchange of thermal lumped
  parameter network models
• Targeting exchange between thermal network
  analysis toolsvarious SINDAs, ESATAN
• Analysis results from SINDA or ESATAN runs, e.g.
  for post-processing
• STEP-TAS is a pure superset of STEP-NRF

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TASverter

• TASverter is an development by ESA D/TEC-MCV
• In Python language on basis of pyExpress
• Offer users finally a properly working solution
  for exchange of thermal models
• First between major European analysis tools
  ESARAD and THERMICA
• Perform rigorous validation of NRF and TAS
  protocols
• Produce a fully functional (open source)
  framework for validation and verification of
  STEP-based data exchange protocols and
  implementations
• Lay a solid basis for the future
• Low threshold for implementation
• Maintainable and cost-effective
• Ensure long term availability (no dependence on
  closed 3rd party software)

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TASverter architecture
ESARAD .erg
THERMICA SYSBAS-to-VIF-export
THERMICA .VIF
temporary route via .VIF for quick development
and verification
THERMICA .SYSBAS
esarad_erg_reader
by Alcatel and OpenCascade
CIGAL2
thermica_VIF_reader
esarad_erg_writer
thermica_VIF_writer
thermica_SYSBAS_reader
cigal_reader
STEP-TAS Repository Handler (produced by
pyExpress)
thermica_SYSBAS_writer
cigal_writer
Planned
Part_21_reader
TRASYS_reader
STEP-TAS Part 21 .stp
TRASYS .inp
Part_21_writer
TRASYS_writer
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Current TASverter status

• Started in October 2002
• 5th release made per 11 February 2004
• Self-contained Windows, Solaris, Linux, Irix
  executables
• No need to install Python
• Coratherm/CIGAL-2 reader/writer completed March
  2004
• By Alcatel Space OpenCascade with assistance
  from ESA
• Used SWIG to wrap CIGAL-2 C library with Python
  API

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Current TASverter status

• Release r2004-02-11 downloadable
  fromhttp//www.estec.esa.int/thermal/tools/tasver
  ter.html
• Support following interfaces
• STEP-TAS Part 21 .stp reader and writer
• ESARAD .erg reader and writer
• THERMICA .SYSBAS reader and writer
• THERMICA .VIF reader and writer
• PATRAN .SES writer
• HTML report writer (to assist end-user to verify
  contents of TAS .stp file)
• Options
• Renumbering thermal node numbers and length unit
  conversion

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TASverter download page
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Simple TASverter run
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TASverter example 1 ISS_coldTHERMICA to ESARAD
711 thermal-radiative surfaces, converted in less
than 15 seconds.
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TASverter example 2 ATVTHERMICA to ESARAD
1700 thermal-radiative surfaces, converted in
less than 25 seconds. Model hierarchy and
coordinate transformations fully retained.
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TASverter example 2 ATVTHERMICA to ESARAD
Original THERMICA .SYSBAS
Generated ESARAD .erg
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Verification Test Suite

• More than 200 unit tests
• Documented as a website
• with naming convention for subdirectories per
  testcase
• actual and reference results for regression
  testing
• Fully scripted to run and be diff-ed
  automatically
• Real model tests
• ATV model
• METOP C/D full spacecraft model
• ISS model
• Herschel and Planck full spacecraft models

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STEP-SPE

• Started in October 2003
• Consortium of Incka (F), EADS/Astrium (F),
  eta_max (D), EPM (N)
• Scope Exchange of analysis and environment
  models for Atomic Oxygen, Micro-meteoroids/debris,
  Contamination, Particle radiation, Charging, On
  orbit perturbations, Plume impingement,
• Currently completed user requirements phase AP
  production in progress
• Extension of NRF and TAS with an SPE schema and
  dictionary
• Produce STEP-SPE application protocol
• Implement converters for ESABASE and SYSTEMA
• Completion planned for March 2005

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Schedule

• Completion of STEP-NRF and STEP-TAS protocols
• WG draft freeze expected May/June 2004
• Start New Work Item in ECSS and ISO TC184 / SC4
• Fast track from WG draft to ISO TS (Technical
  Specification)
• ECSS NWI accepted in February
• ISO NWI expected 2004-Q3